Hi, and welcome to Spark!
Your workout plan is yours to do whatever you think is best for you. What will help you lose weight is your kitchen plan, NOT your workout plan.
Working out gives us healthy and strong bodies. Creating a food deficit is what loses fat.
I would suggest that squash 3-4 times a week is probably meeting all of your cardio needs right now. There wouldn't probably be any benefit in adding any further cardio in there. So you will want to look at adding strength training. Your sparkpeople fitness tracker can set up a strength training program for you if you're not sure what to do. Do you have access to a gym and weights at all? It's not necessary, but it's a heck of a lot easier.
If you spend 30-60 minutes 5-6 days a week on "being active" that will be enough physical activity to see you right for life. Use your eating plan to create an appropriate deficit to lose some fat and get down to a healthy weight.