login in inkscape gallery, your personal menu will appear in the right sidebar. Click on the profile link, you will see your profile page and two edit tabs.
Choose the edit-profile tab if you want to change some of the fields of your profile. If you choose the Edit account tab you will be able to change uesrname, password and the email you use to login in the website.

You have the opportunity to register with a username, you will use this to login in inkscape gallery, and a different nickname, the name the other users will see. But if you want username and nickname to be the same you can do that, nothing bad will happen.
Just remember the t you have to use your username to access the website, your nickname will not work instead.

Not really, some are requested, like "title" or "tags" but you are free to jump the description field even if we suggest you to fill it cause we provided the web-site with many different views and some of that will present the description too.

Login with your username and password, you will see the first button on the left in the header changing to "post your work in inkscape gallery". THen you have to choose the content-type, if you are going to post an image related to graphics in general use the "your graphic work" content, otherwise use the "your web design work" content.

You need to be authenticated before to subscribe to the inkscape gallery newsletter.
It means that you have to register with the account you prefer and then you will se the field to fill with your email address in the right sidebar, in the newsletter block.

It depends, every role has different permission and you may choose thinking about the way you're going to use this web-site.
Choose the "artist" role only if you are an inkscape user and you want to publish your work, we check the new users and if you appear to be an artist but you don't post works we will change your account giving another role. This is necessary cause of the personal profile and gallery that only artists should have.
If you choose "forum user" account you will be able to post topic to the italian and english forum, you can send and receive personal meessage but you can't post your inkscape files.
Choosing registered users is the right choice if you want to be able to see alla the content of the web-site but you're not interested in postinf forum topics and inkscape images.
You will be able to post comments, but you will have to wait for approvation before to publish them.

Hope you don't really need this answer...
Use the large button on the left side of the header, or the "register" link in the menu close to the footer.