The first step is to check the assembly space. POWERCRANK is compatible with most bicycle frames, however there are models in which the distance between the frame and the left crank arm is too small. To make sure that POWERCRANK is compatible with your bike, check if between the rear frame fork and the left crank arm (halfway) 10mm allen wrench will fit.
The currently used left crank arm should be replaced with the purchased power meter.
At least a 10mm space between the crank and the frame is required.