To the left side of the screen there are pull down menus.
Make sure you're logged in.
To have your character portrait show up when you post, click on the 'Eve Forums' menu to open it, then click on settings. The next page that loads - click on 'Character' and select one, then at the bottom select all the options and 'Update Settings'.
To find your Character Portrait, click the 'Eve Insider' menu to open it, then click on 'My Character'. The next page that loads should have your character portraits for your account that you logged in with. Right click on the portrait to view different options, such as 'Copy Image Location' to get link for posting.
Left Click the Net link option just below the text input box (5th icon from the left, just above the Smileys) and paste the 'Copy Image Location' URL into it = http://image.eveonline.com/Character/2075069066_256.jpg
To make the portrait larger, just change the 256 into 512
Or select 'Save Image As' to save it into your computer's hard drive - Eve Folder - Capture - Portraits. The portrait can then be uploaded to other programs.
You already know about the 'Print Screen' key on the keyboard. It'll place screen pics into - Eve Folder - Capture - Screenshots. These also can be uploaded into other programs.
Hope this helps.