Hello Kate, welcome to the team! 
I have added you as a user in the Freeagent (you have probably received an e-mail asking you to set up your password).
Since you will be working on a EU funded project, there are some procedures to follow, mainly: report your time and sign your timesheets monthly & invoice quarterly making sure the time reported corresponds to the amount invoiced. These procedures are described here (refer to the points “for collaborators”).
I will send you your billing parameters in a private message and we can take it from there.