To install the app, navigate to Salesforce AppExchange or Open this ‘https://appexchange.salesforce.com/‘ in browser.
Go to the search bar and search ‘Sales port’ and open it, if you don’t find open this https://appexchange.salesforce.com/listingDetail?listingId=a0N3A00000EGye2UAD.
Select ‘Get It Now’
Login to AppExchange, using your Salesforce credentials.
Now select ‘Install in production’.
Go through terms and conditions and click ‘Confirm and Install‘.
Now select ‘Install for Admins Only’ and click on ‘Install’.
After the installation is completed you will be notified through a notification. And to complete the installation click on ‘Done’ to finish the installation process.
By clicking on the ‘Done’ button, you will be redirected to the Installed Packages page. And installed Customer Portal will be listed in the ‘Installed Packages’ table.