New to this last few feeks

Hi Everyone...I new to myfitnesspal last 3 weeks...but have been dieting counting calorieslast for 6 weeks...first 3 weeks lost 9 lbs before joining myfitnesspal...was 13stone 4-5 got down to 12 stone 9...since joining i am now down to 12 stone 7...I need to get down to 9 stone 7 pounds...Around 133 pounds for my height..I am aged 50...live in Slough in berkshire...I am on alot of medication as I have Lupus and a few other immune disorders including steriods for themy Lupus...so its hard work but so far I am really enjoying it...any tips and advice i pick up from you all would be very helpful and appreciated. Sheila x