Want to edit Mailboxes Module Need Some Help

So i want to edit mailbox module of sentora.

So basic mailbox module has options to add, edit and delete mailboxes and we have another module to launch mailboxes. 

But i want to edit mailboxes module and add button to access the mailboxes directly without password. Like user just have to click the access button and sentora will automatically login to the webmail.

So how can i do that? Which modules i have to edit and where they are located?

Edit: I found the mailboxes module and added Access button but i can't figure out how can i make that button to access the mailboxes without entering login details.