Hi,

Please refer the below documentation.

https://www.odoo.com/documentation/18.0/administration/on_premise.html#:~:text=To%20register%20your%20database%2C%20enter,display%20the%20database%20expiration%20date.&text=The%20expiration%20date%20is%20also,bottom%20of%20the%20Settings%20page

Hope it helps

Hello, 

Follow the below steps. 

Steps to Activate Your Odoo Database with a Subscription Code

1. Log into Your Odoo Instance:
   • Go to your Odoo database URL.
   • Log in with your administrator credentials.
2. Navigate to the Subscription Management Page:
   • From the top-right corner, go to Settings.
   • Under the General Settings or Subscription section, locate the "Activate your Subscription" or "Manage Database" section.
3. Insert the Subscription Code:
   • You will find an option labeled "Activate" or "Enter Subscription Code".
   • Click this option.
   • Enter the subscription code you received via email.
4. Confirm the Activation:
   • Click "Activate" or "Save" to apply for the subscription.
   • Odoo will validate the code with its servers and activate the database.
5. Verify Activation:
   • Once successful, you should see a message indicating that the activation was completed.
   • The subscription details will also appear under Settings → Manage Database.