Make sure the PayPal add-on is installed and enabled in your X-Cart store.

In your X-Cart store's Admin area, go to the "Payment Methods" page and click Add payment method in the Online methods section:

In the popup box that appears, find the name of the PayPal Checkout payment method and click Add opposite this item:

The PayPal Checkout settings page will open for further payment configuration.

Connect to your PayPal account or sign up if you don't have an account with PayPal on the payment setting page. Select the option that suits you:

If you select to sign up with PayPal, follow the procedure it offers you.
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On the PayPal site, enter your PayPal email and password to sign in or register a new PayPal account if required:

Follow the flow allowing your PayPal account to connect to your X-Cart store.

As a result, your PayPal account should connect to your X-Cart store with your PayPal account details submitted automatically to the "PayPal Checkout" page of your store Admin area.

Enable the payment to make it accessible on the storefront.

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NOTE: Make sure your store is using HTTPS. If not, you can enable it on the Settings > Security > Enable HTTPS page.