It would help if you could link to the area and explain what's wrong. "Just changing a name" is straightforward, but a link to the area would show if anything else needed changing too.
If using the iD editor, navigate to the area in OSM, zoom into the area you want to edit, click the edit button at the top of the screen, click on the road you want to edit, on the left you'll see all info about it, edit the name there
It would help if you could link to the area and explain what's wrong. "Just changing a name" is straightforward, but a link to the area would show if anything else needed changing too.