It means that you need to add a credit card to your PayPal account to buy something online and PayPal will charge the credit card.
You may also use your PayPal funds (if any) to make an online purchase but the usage of PayPal balance depends upon where you live.
I suggest you to contact PayPal for more details regarding this.
Hope it helps!
Sahil Reviewed by Sahil on . [HELP] how do i add funds to my paypal account i got this messages when i clicked on add funds link at my account tab "Add Funds is Not Available PayPal does not currently offer the ability to add funds from your bank account. When you make a payment, PayPal charges the buyer's credit card and instantly credits the seller's PayPal account." Rating: 5