Yes, this is no problem at all. When our workers try to log in via the Jagex Launcher, you will need to provide the access code via email that you will receive. Then he can enter your account to the Jagex Launcher system without any problems.
Once you have ordered your desired ironman services on the website, a live chat will be automatically opened. We will invite you to our services Discord, where you can open a ticket. Please mention the order number that you received via email when you open this ticket, and specify all the other information required. One of our Managers will post your service so that workers can claim it. You will be asked within the ticket to leave your account credentials so that the worker can start immediately once he has claimed your ticket. Only the worker who claims the ticket can see your account credentials. Please make sure to change your password before & after the service and follow all the directions from our Discord & within the ticket.