Adding orders to Amazon

[HappydaysArehere]

Sorry to sound so dim. Amazon will send postage free if I spend £20. I was purchasing something for £15 and postage was £4.50 and I wanted something else but being inept I couldn’t figure out how to locate the other page offer without losing the order. There must be an easy way. I just ordered the one thing as it had taken me ages to find it.
However, I want the other item and intend to add it to something else quite soon. I don’t order enough to warrant Prime so just use the standard delivery.

Sorry, forgot to thank anyone who is reading this.

Add it to your basket and continue shopping - you can hit the back button and then add again to basket. If it's an add on purchase from the same seller, there should be an option to click on the link to the sellers other add on items.

Is the first item sold/ fulfilled by Amazon? It needs to be for the £20 minimum spend.

If it is, then as above, add to your basket and then you can move away from that page and add other things.

Thank you hotdog and MrsMaisie. I was attempting to add another item to bring the purchase up to over the £20 amount (£24). So next time I will hit the back button and search for the second item. It said at check out that I only needed to spend £5.10 more to have free delivery.
Thank you again.