how to make this variable work in social groups and album pages

[Super Jinni]

here what I did (not sure if that what you mean in your first post of this thread):
- I opened the files album.php and group.php and looked for the variable $custompagetitle.
- I found three found the that the variable is defined 3 times in group.php and 4 times in album.php
- I added new plugin in the global_start hook.
- in the new plugin I made a new variable and named $new_pagetitle and set its value to the same $custompagetitle set to int the php files.
- I then used the $new_pagetitle in the navbar template but still nothing showed.

did I do it right?