Set Credential Activity Orchestrator - how to set up Robot Role with edit permissions?

i want to enable the user to set their own asset credential in orchestrator, withouth giving them access to the orchestrator itself.
I planned on setting up a bot, that changes the asset via the Set Credential Activity.
refering to this article it states:
" Please note that to execute this activity, the Robot role needs to have Edit permissions on assets."

Unfortunately i am unable to edit the robot role.
I’ve been looking at Tenant → Manage Access → Roles → Robot

but there is no way to either see the permissions nor edit them.

Please give me some advice, on how to set up the robot role to edit assets via the Set Credentials activity.