1) download a texture pack. There are alot of great free textures on sai but this is a good starter pack ( Don't worry, it's safe.) It comes with these textures
2) open up the folder in which your texture pack was downloaded into. On my computer it will be in your downloads and be a zipped folder named sai-eng-pack-1.1.0
it will have a folder inside it called 'sai-pack' and inside that folder will be multiple other folders. It should go in order like this
blotmap
brushtex
do-it-yourself
elemap
papertex
toolink
toolnrm
language
pack-license
presetcvsize
start-sai
we will only be using the items in bold.
3) Open up the folder c