How to install a Shopify theme? To install any theme in your Shopify Store, first open your Shopify store, then click online store button, at the left side of your screen. After clicking online store, a new window will appear in the theme’s section, scroll down the page and then click on upload theme. When you click on upload theme, a pop-up window will appear. In this window, click on Add file. You can also drag and drop files here. After clicking on Add file, your computer’s window will appear and you have to select your desired theme from your computer. Theme must be in zipped file. When you select your desired theme, open it and you will again move to pop-up window. Here you can see your selected theme. Now click on upload file button, When you click on Upload File, your theme file will be uploaded. Now, click on Actions, and then Publish. When you click on Publish, a pop-up window will appear. Here, again click on Publish and your theme will be installed to your Shopify store.