On the project where I am working the openstreet map is used in iframe. When I try to go to links I cannot see where to edit popup text for the marker, I can edit name and all other things except for popup.
Hi and welcome to OSM. OSM is a database, therefore there are no such thing as pop-ups. Pop-ups are usually provided by a 3rd-party-framework that uses OSM-Data or maptiles created from OSM-data.
Where do you see these pop-ups?
Your screenshot looks like a ‘product’ map rather than the actual data. You need to enter into ID Editor e.g. to change the value. Then it will take a little before you will see the change in the map render view, depends on the map renderer how often they refresh the data on which they build the map.
You are using a service called uMap which is a 3rd-party product based on OSM data. I don’t use uMap but I assume somewhere in uMap you can configure which information should be displayed in the markers pop-up.