Step 1. First of all open the Boomerang Gmail Website in your browser. Now click on the big red button there Add To Browser
Step 2. Now a pop-up will appear and you there click on Add button. Now you will see that extension will get added to your browser.
Step 3. Now login to your Gmail account where you want to schedule your emails.
Step 4. Boomerang will now give you a startup tour on how to use it. Simply skip it by clicking on “Skip”
Step 5. Now there compose the email, and there you will see a “Send Later” Option showing just behind the “Send” option.
Step 6. There you have to select the option of “Send Later” and then you will be able to see all schedule option that you want to set. Choose it according to wish.