I cannot test the URL in simulation

When I opened the Level Blue prints tab I created Event Graph that with nodes on read only and complied it and save it. I assume this is why I cannot test my URL created with nodes.
I heard that I have to turn-of the runtime, but I don’t know how to turn it off on default font Roboto. Actually I am not even sure that the text render actor, I used to implement a URL, is something I have to change. Please help me to resolve the problem of testing my project. How to go out from the read only, and what else could be the reason for not being able to test the file Unreal Engine file in simulation. Thank you very much.