Display name vs Login name

[jluerken]

Sry Mod, I posted this question already in a thread but in the vb2 forum which was wrong.

I give it a try here

I am importing my UBBT to vb3 and have one problem.

UBBT decides between a users Display Name which is the name shown all over the page (beside a post for example) and the Login Name simply used for the login.
This is fine with me cause the users have the change in changing their name this way.

Now I want to implement a Display Name also in vb3.

Therefore I created a custom field with the id5 (profilefieldid5)

I went into my postbit_legacy Template and changed:

$post[username]

to

$post[field5]. I also tried $post[profilefieldid5]

but nothing worked.

I want on ALL my pages the displayname to be shown.

Any idea what I am doing wrong?
Please help me cause I need to implement this urgently.

Many thanks in advance...