When you create a group, the form asks you to mention URL. This is actually not the full URL, but rather a 'slug' that is required for creating a link. E.g. if you want your group direct to http://www.sewist.com/groups/transewist, you need to enter transewist in the URL field.

It should be English letters only, and you can include a dash ( - ) and underline ( _ ). E.g. trans_sewist and trans-sewist are also fine.

I am still looking for a good term for this field, as it will be also present in stores. Any ideas? :)