PER counter-sign

Hello,

I have completed all my PER challenge questions and my employer have signed off all of them using Experience Tool. Now I need to get my challenge questions counter-signed though my Employer mentioned the details of my training supervisor in my experience as I had provided them with it.
I am unable to understand what I need to do next! Should I apply online for membership as my experience tool shows performance objectives as achieved. Or should I get them counter-signed first which I will get tomorrow?
And after I have got them counter-signed do I need to send them to ACCA or is it okay to apply online for membership and just wait for ACCA to ask for them? Pls guide me as I can’t find much information on ACCA website.