I have £200 in my account, and I want to send $100 to someone, it's not letting me at all? I'm not sure why it's not letting me send anything?
Then wait for 24-hrs as it may take time to fund the Credit Card. PayPal is showing this problem as your Credit Card has insufficient fund in it.
Call your bank up. If you have online banking facility then use that to check if the money is loaded to your credit card yet. Incidentally is your paypal account verified with this credit card you are using ?
Look behind your credit card, there should be your credit card support center phone number which you can call 24/7. Even if the bank is closed, their credit card phone support should be open.