Trying to lose weight - need some advice please?

I am trying to lose about 15 pounds and I am having trouble doing so. I have 2 toddlers and my husband is deployed so gym and running in the mornings is kind of troublesome for me. Does anyone have any advice about a good diet and exercise plan? (Mainly need to work on my abs and legs, my arms need a little toning but my abs and legs are a bit chub.)