Worked for 2 companies within tax year so I need to know how to fill in my tax form now on eFiling.

I worked for 2 companies with in the tax period. (one for 6 months and one for 5 months) - do I click 2 tax certificates received? how does SARS eFiling pick up the information?

Yes, you need to click on 2 tax certificates received. The IRP5/IT3(a) tax certificates should have been submitted by your employer to SARS and therefore should automatically be populated in your Tax Return. If the information is not there, you need to request a copy of these certificates from your employers and fill in the information in your tax return yourself.