If I change the battery in a 2011 Mercedes GLK 350 will it damage the computer or lose the settings?

First thing to do is have the battery tested, this sounds like a low battery voltage problem.

Yes,
See link below:
https://www.amazon.com/Keep-Clean-SS4500-Setting-Battery/dp/B004SXYEW0

Oil change greased tires rotated it wants checked at the mercedes doctor

That is your 44,000 mile checkup. It includes: oil and filter change, battery test/service, starting/charging system test, lubrication service (door strickers,hood hinges,seat slides and sunroof tracks, cooling system pressure test and inspection, bulb inspection int and ext, inspect/adjust windshield wipers, rotate tyres,check pressures/abnormal wear, check undercarriage for wear/debris, add moa motor oil additive, brake system inspection fluid/pads..rotor condition and lines, visual inspection of suspension and steering components, road test, reset service reminder light

Call your preferred Mercedes dealer to set up an appointment!

Contacct mercedes dealer

if your cluster is mechanical, then it is not possible to change the settings. you can attempt to get a genuine cluster from Mercedes Benz by using your VIN and request for a cluster that displays KPH.
However, if your cluster is Digital, or uses an LCD display, then you will need a STAR DIagnosis tool, hook it up to the car, and perform something known as SCN Coding to the cluster. There you will have the option to change it from MPH to KPH

In mercedes benz glk 350 engine tapping noise

What does service BO mean on 2010 mercedes Glk

a E280 WILL FIT 2010 THRU 2013

Pls show a video of how to change headlight bulb on glk 350