Professions

Hey, I'm playing wow for almost a half year and in the beginning I made a blood elf paladin.
On my pala I learned the professions: engeneering and blacksmitting. I thought I could learn more and not 2.
So my questio is: How do I remove one? OR Can i remove one?
And I don't want to remove my pala because he's 40 now and he's my strongest charakter.
Already thanks for help.

Go to your Skills tab, and

Go to your Skills tab, and where you see Blacksmithing and Engineering, there is a little Red box with a yellow X in it. click which ever one you want to drop.