Put roughly 6 inches or soil or compost in the bag. Place the chitted potatoes on top, growth pointing upwards and cover with soil about another 6 inches. When you see shoots/leaves poking through earth up i.e. cover with soil/ compost and keep doing this until the leaves reach the top of the bag. You need to water regulary so the tubers/ potatoes swell

Do you mean potato bags or grow bags Doris potty?

Thank you Great for your answer to my question.You've given me a good explanation about what to do and i shall be having a go at growing potatoes this year.

Hijuju thank you for responding to my question.I was asking about potato bags

phew I was a little worried there for a moment when Hijuju said grow bags I just assumed you meant potatoe bags. Im so glad you did, otherwise I would have had to re do my answer lol