If ur plan is to have three shakes per day then continue having them but have ur SS + meal as an extra. That's ok I'm still getting 2 grips with it as well but if there's anything I can help you with let me know! Some examples of a SS + meal are:
170g skinless chicken or turkey breast
180g tinned tuna only in water!
230g cod, haddock or other white fish
Plus
80g cooked or raw of the list below
Broccoli
Cauliflower
Salad leaves
Mushrooms
Spring onions
Cucumber
Green peppers
Cabbage (u can also have this pickled)