Once i have created a jagex account would other people then be able to do jobs for me? i mean can they log on to my account?

Yes. Anyone who says they can’t is most likely using a 3rd party client of some sort. The set up of logging into a jagex account while different is still easy to do.
Hope this helps

So this means if i were to have a service on my new jagex account with top security people can still get in on my acc to do the job ? with my permission ofc.

Yeah, i think the only real difference is that you have to OK the sign ins. I’m not super familiar with ins and outs of the jagex account but have serviced them in the past.

Great! thats all i needed to know!

Glad to be of help!