Good on you with the weight loss!
As far as muscle toning goes, a good idea would be to get into some resistance training/strength- type exercises. This type of exercise (alongside a healthy, balanced diet with adequate protein) stimulates the muscle encouraging it to grow and become more toned.
You could perhaps get a training program from your local gym, or invest in some small weight and/or resistance bands and jump on Google to find some videos which will run you through some exercises.
BT Nutritionist 🙂