Yes, you can change your store link but before you do remember that the older store link will stop working.

Here's how you can change your store link:

First of all, click on "Edit business details" under the "Account" section and then click on the Store link and you will be able to change your store link accordingly as shown in the screenshot.

Note: You can also buy a custom domain and link it to your Dukaan Store. This is a paid feature. Click here to learn more.