What method do I use to synthesize propyl-2-(2-methylpropyl)-ether and why? I need to know which method to use to synthesize propyl-2-(2-methylpropyl)-ether.

I considered electrophilic addition of alcohols to alkenes, but I'm not really sure how the method works, and anything I found on it was hard to understand. From my understanding I need to "add" electrophilically activated alkenes to alcohol.

I don't really know what that means. I was thinking of using t-butanol and propylene, but the whole part of electrophilically activated alkenes threw me off. Any advice or help is greatly appreciated!
There are two basic choices here if you are trying to do this on a lab scale. The alcohol plus alkene with catalytic acid is not an approach I would consider unless I needed a lot of this. t-BuOH plus acid is a recipe for isobutylene. Sodium or potassium t-butoxide is commercially available and reacted with an excess of iPr-I should give a decent yield of the ether.

The other approach is to use t-Butyl 2,2,2-trichloroacetimidate compound details here - a general reagent for the formation of t-Butyl ethers originally reported by Armstrong et al, Tet. Letts 29 2483 (1988)