combi boiler - new rads sequence

[Thermo]

Right ive done a search and cant find the answer, so apologies if its been answered a million times before and i humbly accept im a dofus.

I have a vokera combi boiler that was intalled in our loft conversion and thinking ahead i asked the plumber to leave a couple of tails ready for me to add the new rad in the loft conversion. No problem so far, but once ive installed the rad and piping (he left a flow and return with a service valve on each.) whats the correct sequence to fill new rad and pipework?

cheers in advance

 

[andy]

add rad: open valves, bleed rad keepin an eye on pressure. done.

 

[Thermo]

simple as that many thanks