Can purchasing a Shopify theme enable editing of existing store theme?

Dear Sir/madam,

I hope you are doing well, I recently had a question regarding shopify theme store settings when editing my colours on footer menu however I was unable to do so. I received an email stating I do not have a shopify licence and need to buy one. If I buy a theme from shopify will I be able to edit the store theme I have already created?

Thanks

Kind Regards

Harpreet

Have no idea what you are talking about. Show url pls.