How do i...add custom string on my order page

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PHP

I would like to add a custom script on my order page.

I have various subscriptions on which a sign-up fee is payable now and the recurring fee is payable monthly.

The user can choose when the monthly fee should start

The page"

1. Product
Here the product is displayed
2. Subtotal
3. Coupons / Discount
4. Total
5. Recurring Totals
6.Suptotal
7.Discount
8. Recurring Totals

I would like to add a custom string between Product and Subtotal
I would like to add "Payable Now"

would it be possible to do that

What I have tried:

I really don't know where to start