The clear lens will separate from the white base. Slip a thin bladed knife between the lens and base and work it gently until it pops off one side.
The LEDs inside may not be replaceable, depending on the brand of your light, if that's why you want to take the lens off. Let us know if this works.
If you're going to "regret it in the morning", sleep until noon.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley