I sold an item with "buy it now", however it will not let me add a shipping cost so I can send the invoice to the buyer. How do I fix it?

[storminwolf]

I added a buy it now for a buyer, however now I cannot add in the shipping cost to the final invoice. It asks for a valid shipping cost but does not accept anything I put in the box. I have never used "buy it now" so I'm not sure if i have done something wrong. How do I add the shipping cost?

[femmefan1946]

Are you hitting "recalculate"?

Don't.