Converting indicator to EA?

i have an indicator that signals sell and buy. how do i convert it to perform auto buy and sell?

You really don't want to do that, you can but it's a little involved, there is a good article here, it explains how to create your own buffers etc.

Transferring an Indicator Code into an Expert Advisor Code. Indicator Structure

but the normal course of action is to get access to the data in the Indicator's buffers using iCustom(), and use that data in your EA, it is much simpler.

You can find more info on using iCustom() here: Detailed explanation of iCustom - MQL4 forum

Agree with you. The process is complicated if compare to using iCustom