"To store the stylus" means to put the small pen-like device used to interact with a touchscreen or tablet away in a safe place when it is not being used. Full definition
We'll refrain from commenting on the absurdity of that recommendation, but it's particularly frustrating because there's nowhere to store the stylus on the device. (arstechnica.com)
Lenovo also includes a bay for storing the stylus in the side of the tablet when it's not in use. (laptopmag.com)