Thanks for the screenshot. You don't need a button to trigger this flow becase it will trigger automatically whenever a new item is added to the SharePoint List.
I wouldn't use the Create an approval but use Start and wait for an approval (V2) which is newer. It will send you the approval email and wait for your approve/reject response then the flow will continue with the rest of the actions.
Rob
Los Gallardos
If I've answered your question or solved your problem, please mark this question as answered. This helps others who have the same question find a solution quickly via the forum search. If you liked my response, please consider giving it a thumbs up. Thanks.