Can anyone tell me how to go about posting pictures in the forum? I'm still figuring the forums out. Thank you!

Sarah, the first rule is that the picture has to already be on the internet. Such as Google or some other site. You can add pictures you've taken by first adding them to a web photo site like Photobucket. Then it's as simple as "Copy" and "Paste" into your text.

With some photos, it is as simple as right clicking copy and then paste where you want the photo.

That applies to photos that are already on the internet.  I open two windows and just copy and paste.  But if it is your own photo, then you need to post it elsewhere online, then copy it. 

For the siggie photos, it is a matter of making them small enough.  There are specific size requirements.

Another member made a tutorial video on how to do that http://www.paperbackswap.com/Couple-Video-Tutorials-Made-PBSers/topic/292235/

Oh!  Yummy.  Videos from Chris.  I've been referring folks to her tutorial about sizing avatars and siggies for years.  

Chris B.'s tutorial for embedding images and creating text links in PBS posts are helpful and worth watching if you don't know how to do these things.

A related, but different, problem is how to embed images and create text links in PMs in addition to forum posts. PBS uses a simpler and less sophisticated editor for PMs than it does for forum posts. The only way I know to include images or to make clickable text links in PMs is to use HTML coding. Although it takes extra work to do this, it is not difficult once you learn how. An important caveat to remember, however, is that the syntax cannot contain any errors or you will likely lose not only the link but also the entire text of your PM following the intended link.

This is not a tutorial on HTML coding, but rather  a simple illustration of using HTML to embed links into PMs (not forum posts).

Creating Image Links in PMs
The basic HTML syntax is 
<a href="the_URL_where_the_image_is_located">whatever_text_you_want_to _identify_the_image</a>

The text highlighted in black is the HTML envelope, and the text highlighted in blue is provided by you to specify the image URL and to identify the image. The black text is enlarged and bold-faced to make it stand out in the example, but should be typed as normal text in your PM.

As in forum posts, images must already be on a website or posted somewhere online. Bring up the image in a separate tab or window from your PM, right click on it and select "Copy Image Location". Then go to your tab or window with the PM, type <a href=" , paste in the URL for the image using Ctrl-v, type "> , type in the text you want to identify the image and, lastly, close the statement by typing </a>

It is important to remember that the syntax must include the characters <a href="  ">  </a> with the image URL and text you provide in the appropriate locations, else it won't work.

Creating Text Links in PMs
Text links use exactly the same syntax used for creating image links as described above.
Open the URL to be linked in a separate tab or window, highlight and copy the URL from the browser tool bar, then paste it into your PM between the quotation marks and enter identifying text between the angle brackets.

<a href="a_URL_address">whatever_text_you_want_to_identify_the_link</a>

As noted above, getting any of the syntax wrong will likely cause both the link and the remainder of your PM to be lost and disappear.

Thanks so much everyone!