It is difficult to help you without more information from you. I need you to to give me all the details so I can reproduce the problem you are having then I will probably be able to assist.

What do you mean by "cannot access", are you unable to log in or are you unable to upload a file?

If it is a problem uploading a file or image, does it meet the maximum size requirements and type? Do you have characters like ? or @ in the file name that may not play nicely with the upload system?