Stir it up and it will stick to whatever you're stirring it with. If the mixture sticks to your fingers, add more liquid starch. If it won't stick to itself, add more glue. Store in an airtight container in the fridge. If you want the mixture to get tougher and thicker, let it dry out a bit in the air.
Silly putty is lots of fun to cut with scissors.
Also use some playdough toys with it, or ice cube trays, muffin tins, plastic strawberry baskets, etc. This often sticks to clothes, hair, furniture. If you get it on fabric, use vinegar to get it out. Again, watch out for cheap glue that has too much water in it. Now, while stirring the Borax mixture constantly, add the glue mixture.