How to make units walk ?

[slime]

Hello i posted the same question on thehelper forum and they told me to lower the MS on the units ( ?) and they also told me to ask the experts at hiveworkshop (hehe) so anyway here i am asking the same quest:
Is it possible to make units walk? Or in the worst case make them run slower?

And btw im too stupid to learn Jass so is it possible to do it in world editor?