Access to community builder database fields

Hi,
I need to 'read' one field in the comprofiler database (user data) and use the value of this field in a condtional/logical statement (like if ($cb-var != 0)).

Later I have to update this field with a new value (like $cb-var = $cb-var + 1).

And I have got completely lost in Joomla API, Community Builder API, CB Subs database plus a couple of components php files.

How do I get the cb-var into a $cb-var in my little function in some huge complex system -and how do I change this value later in the proccess?

Please see tutorials within my signature on how to include CB API and establish a $user object. You'd apply your login directly to the $user object. For example $user->myfield = 123 then perform a $user->store().