How do I attach pictures?

[BHAFC_AMEX]

How do I add a picture to a post? I tried before and it was just a red cross. It says to type the URL of the picture, where should I upload the picture to in order to get it to appear on here?
Also, are there limitations on picture size etc? If so, how do I size it correctly?

 

[Braders]

Go Advance > Manage Attatchments is one way

or

 

[BHAFC_AMEX]

Go Advance > Manage Attatchments is one way

or picture link [ /img] with no space between the [ and the / for the last one[/QUOTE]


Thanks