Your name and player details such as club, county, country and DoB are often received along with your results so if any of those are wrong then it's likely that they are wrong on the source system and should be corrected there. Once those details are corrected, they will come over with new results and then they will be updated on SquashLevels.
An alternative is to correct your details directly on SquashLevels which can be done by clicking on the three dots at the top of your profile page which will take you to your player details page. Here you can update any of your player details. You can also lock your details on SquashLevels so they are not updated by new results coming in which is a more permanent solution.
Note you can only update your own details this way. You need admin permissions to be able to update other players.