It is very easy to install the Flash Search app on your Shopify store. Please follow the steps below:
Step 1: Open this link Flash Search
Step 2: On the app page, click Add app.
Step 3: In your Shopify admin, to authorize the use of the app, click Install app.
After the app is installed, in the Shopify admin sidebar, click Apps -> Flash Search - Filter & Search. You will be redirected to the Flash Search Dashboard on a different page.
Once you have installed app, installing layout is the next step you need to do. Please check next tutorial, we are going to learn how to install layout.
