Predefined Thread Subject

[SirSpins]

hi,
ive been looking around and i couldnt seem to find the answer to the problem i am having at the moment.

im trying to find away to get the Thread Subject  to be a predefined Title



so e.g the area Thread Subject would take the username of the current account that will be submitting the form and also add stuff like application on the end like this.



and to also have it so its unable  to be changed by that user


ty to anyone thats able to help me.