Key Binding

Can someone please help me with this as its annoying for me that I cant figure it out.
Every clip on youtube I see of someone using Rapid Shot and Plasma blast their characters are moving while fireing and no matter what I try I cannot get my character to do this. I will point out that my character is not using WASD but keyboard and mouse. The problem lies with right click is reload and left click is fire, left click is greyed out and unchangable. Im sure im looking at this in the wrong way but cant see how, so can someone please point out where I am going wrong so I can also move and fire at the same time.

WASD lets you move and aim independently, since then you can ie. move away from an enemy while having the cursor on them and using a skill.

You can also bind a pushtomove button if playing with nonWASD M&K controls. It isn't under input, I think you have to click a skill bar slot and then the push to move command is there. idk why it isn't under input and has to take up a skill slot. But, that might help. I highly recommend trying WASD though, I thought it would feel like crap after playing so many mouse movement only, maybe push to move but mouse indicating movement Diablo and clones. But now I want WASD in all ARPGs.

Thankyou for the reply unfortunately clicking one of the skill slots only gives you the move function not shoot and move so sadly im still stuck on this. I tried wasd but I found that only gave me up down left and right, shooting on an angle was clunky at best.