User Quota

Users quota

WP Cloud offers a standard user-quota of 10MB, that is applied by default to every member. You can change this value to give all the users the space you want. The quota for each user is stored in a meta-field for each profile with the following criteria:

This is what I read and what I am having an issue with.
Where is this ‘meta-field’? I look at user profiles.. not there.

Also written:

can be accessed from website.com/cloud and give users the opportunity to log-in and manage their file

Where is this log in? i can not find it either.

I am an intermediate user so I thought I could find these things, but just get lost.

Please, some one help.
Thanks