[How To?] Change The Additional Contact Information

[Serpius]

I would like to change these 2 input boxes in the UserCP.

AIM is dead as AOL closed it last year. 
Who uses ICQ anymore?

I like to change them to Discord and Twitter.

Can this be done without messing up the website?

I do not know anything about CSS and/or PHP. 

If you are giving instructions on how to change this, please be specific as possible!