Creating a username on a webapp is a simple process that allows you to personalize your account and make it unique. Here are the steps to follow:

1. Sign up or log in to the webapp using your existing account credentials.
2. Navigate to the account settings or profile section of the webapp.
3. Look for the "Username" or "Display Name" field and click on it to edit.
4. Choose a username that is meaningful and represents you or your brand. It should be unique and easy to remember.
5. Check the availability of the username. Some webapps provide a real-time availability check, while others may require you to submit the form to check availability.
6. If the username is available, save your changes. If it's not available, try different variations or combinations until you find an available username.
7. Review your profile or account page to ensure that the new username is displayed correctly.
8. Congratulations! You have successfully created your username on the webapp.

Remember, your username may be visible to other users of the webapp, so choose wisely and consider the image or identity you want to portray.

If you encounter any issues or have further questions, refer to the webapp's help documentation or contact their customer support for assistance.

Happy username creation!