I am away for a week, from the 13 July to the 20 July. I need to let ppl know looking at my shop, this information but
I dont know how to do this.
You don't have a store on this ID, it is a normal account.
Only store holders have the holiday feature.
You may be better to end listings and relist on return.
You can extend your handling time to 7-8 days but buyers often don't see that and may mark you down for slow postage.