Step 1: Open the taxstick-frontend folder first.
Step 2: Then you need to find the next.config.js file and open it in your appropriate text editor. Now you have to replace the red color marked BACKEND_URL with your backend server URL (which is already created during the backend installation process) within the single quotations mark.
Step 3: Then you need to open your terminal (mac and linux user) or command prompt for windows. Type yarn run buildexport and hit enter. After build successfully, you can see Export successful message and then you will get out folder/directory.
Step 4: Now zip the inside files of the out folder and upload it to your server.

After successful completion of all the processes, your website will go live, visit your domain url, for example your_main_domain.com