Good days,

I'm new user of Chimera therefore I need help using build structure option of program. 

I want to add MRAE residues to N-terminal of enzyme as an alpha helix structure but I can not use the directions of tutorial such as:

addaa tyr,30 :29.a

- add tyrosine in an extended conformation as residue 30, after residue 29 in chain A (the new residue will also be in chain A)

Where can I write this command? 

I'm trying to add four residues to N terminal but I'm adding them to another point. I'm sending the screen image.

Please help me.

Best regards

Dilara Karaman