the receive tab is used for
creating a request for payment.
imagine you want to ask your friend to send you 0.144
BTC. for that you need to give him your bitcoin address and ask him to send you 0.1
BTC.
bitcoin makes it easy with a special URI pattern scheme called bip21.
what you created is this URI, it is like a link eg.
https://bitcointalk.org and when you click on it, instead of a browser your bitcoin wallet opens up.
if you scan the QR code it is like this:
bitcoin:1FYkXwCvqPZVFmyDjnEVSnvjCr6iaPTWSh?amount=0.144 (you can click on it and see what happens, it will open your electrum wallet and goes to send tab and fills in all the information for you).
this whole thing has nothing to do with "transaction being stuck".
[1]
https://github.com/bitcoin/bips/blob/master/bip-0021.mediawiki