Hello,
I would like to use URLs instead of uploading the avatar to my website.
People will put their image url and it will automatically be their default picture.

I would also like to know, if there are other commenting modules available, like Disqus. I need one, so website users don't have to sign up for a disqus account.

Comments

Please I need help....

Please I need help....

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I don't know that there is a module that does what you ask with regards to user pictures. Core expects the user pictures to be stored on the server where drupal is installed.

There are modules in the downloads area that may help but you will have to investigate them, ie: gravatar.module there may be others as well.

with regards to the commenting system, I can't help. I am not familiar with disqus.

In future please tag your thread with the version of drupal in use. At the very least mention which version is in use in your thread. You will receive more help that way as things change from version to version and without knowing what version you are using you leave support people to guess.