To add these to your signature in an Ezboard forum such as MLPTP you must be signed in. Go to "My Control Centre" and click "Account Preferences" then in the custom signature box enter this code:
[link=http://www.fortunecity.com/athena/dance/275/nursery.html newwindow]
[image noborder]your_pony's_web_address_here[/image][/link]
That will put the image of your pony on the bottom of all your messages and when people click on it they will go to Misty Mountain Nursery. Or you could use this variation:
[image noborder]your_pony's_web_address_here[/image]
[link=http://www.fortunecity.com/athena/dance/275/nursery.html newwindow]
your text here[/link]
This will put the image of your pony on the bottom of all your messages with a line of text under it and when people click on the text part they will go to Misty Mountain Nursery. If you need any help, check out the testing forum on the MLPTP for a more detailed guide.