Hi Cathy, I'm a new poster but long time grower. All the MSU fertilizers I'm aware of are water soluble which you add to water and it makes liquid fertilizer. If you're are worried that the clumping will ruin the fertilizer, don't. It will be fine. Sometimes when my fert is very clumpy, I'll use warm water to help dissolve it faster.
If your MSU fert is formulated to be sprinkled on surface of the mix, I still wouldn't worry about it and just break up the clumps.