Log in to your account on the vBulletin based forum. On the menu bar click on "USER CP". This will show you your user profile. Next, locate "Edit Signature" along the left under then menu labeled "Your Control Panel". You will see a What-You-See-Is-What-You-Get (WYSIWYG) editing box.
In the box type the text that you want in your signature. If you want the text in your signature to also be a hyper-link then highlight the text then click on the "Insert Link" icon on the editors toolbar. The "Insert Link" icon looks like a globe with a link of chain at the bottom of it and overlapping the globe. In the pop-up box that appears type the URL for which you want the text to link.
Example: I have a blog it's URL/web address is http://mrcomptech.blogspot.com. The text I want in my signature is 'Blogger.com: MrCompTech', so in the editing pane I type 'Blogger.com: MrCompTech' (without the quotes). Then I use my mouse to highlight 'MrCompTech' in the text that I just typed. Next I click the "Insert Link" button/icon on the toolbar. In the pop-up window that appears I type 'http://mrcomptech.blogspot.com', again without the quotes. Lastly, scroll down to the bottom of the page and click on the 'Save Signature' button.
That's it, now when you go back an look at your posts you should see you new signature. Depending on how the forum administrator configured the forum this may apply to all posts, even if they are old posts.
