I use different materials and take the glass off and put it on depending on what material I am printing with. If I just want to use the glass for a one or two prints I will use the z offset to save time. It is a short term solution.
In the build plate adhesion menu click on the gear/setting icon. Click on the Z offset box. If you hover over it there is a brief description of what it is.
Measure your glass and input that measurement in the z offset box that should now appear in the menu. If your glass is 10 mm input 10 mm. This raises the nozzle 10 mm from the bed where it thinks 0 is.
Slice and then try. You can also fine tune if your printer has Babystep Z in the tune menu. You can adjust up or down in small increments during the beginning of a print (anytime really). I use a purge across x and usually a skirt before the part.
If I am going to keep the glass on for a while and I will home the printer, disable the steppers (in LCD) and by hand turn the screw that raises the z axis until there is enough room to put the glass bed on. Move the table under the nozzle and lower it until it is just above the bed. I put the paper I use for leveling on the bed and when it touches stop.
Loosen the Z limit switch on slide up the side until it is fully makes contact. You will hear a click. Tighten the bolts holding the limit switch.
Enable steppers and then home the printer. Manually level from there or whatever you do to level.