Edit shader's variable through script

Hey guys,

Basically, I can’t figure out how to use This shader. I want to change the texture on the ground in-game, but I can’t figure out how to change the “_blend” variable in my script.

Also, sorry about this short and, no doubt, poorly worded question. I’ve had a headache all day, and can’t seem to think clearly. If anyone needs clarification, please just ask.

-Thanks for all your help!