For the frizen fruits briefly defrost or pass under hot water qwickly to soften just enof to slice and chop thru.then add half cup or less, water for easy blend.can use hand blender or even hand whisk

Then after getting nice berry syrupy consistancy,add your yogart and gently fold in or just stir in to get an even mixture or can again use hand whisk or electric if prefer but electric whisk not necessary at this stage.

Pls add more water to reach required/preferred consistancy.(try make it not too runny,as will affect the taste!)