Please see the step-by-step guide below:

Go to your Shopify Admin Dashboard.
Click on the Eggflow: Instant Traffic app.
Once you are inside the app, click on the "Manage Plans" option on the top right corner of the screen.
This will take you to a new page, where you can see your current subscription plan.
Click on the "Change Plan" button located next to your current subscription plan.
A new window will open where you can see all the available subscription plans.
Scroll down to the bottom of the page, and you will see an option to "Cancel Subscription."
Click on the "Cancel Subscription" button.
You will be asked to provide feedback on why you are cancelling your subscription.
Select the appropriate option, and click on the "Cancel Subscription" button.
Once you have completed these steps, your subscription will be cancelled, and you will not be charged for any future payments.
Please note that you will still have access to the premium features until the end of your current billing cycle.

This guide apply to
Instant Traffic
Instant Buy
Instant Giveaways
Shop Secure
Smart Pop
Instant Review