A lot of the same questions come up from time to time regarding different profile options available, how to add a custom avatar and such. Here's a good link that may answer some of the questions you may be having:
For specific help on the different code options available within a post (such as inserting an image, URL Hyperlinking, etc) take a look at this link:
Try reading that first, and it may answer your question. If you still have problems, please feel free to post here for further help.