I have 3.3.8 installed from electrum site not Play store. I have some early paper wallets. I created a wallet on my mobile and did not use normal "new wallet or standard" but created it with seed words. Everything worked fine and btc showed in mobile wallet.

I open that same wallet a month later to spend to another different existing paper wallet of mine.
I choose SEND
I entered the different paper wallet address, some dust, left the transaction rate at full and replaceable.

I pushed PAY...
(I may just be have a GUI mindblock but)
and the next screen shows; (here is where I get lost as it makes no sense to me)

Transaction

Status           Unsigned
Amount Sent
Tx fee
Tx fee rate

Outputs
then lists the receiving wallet address and the amount sent
and the sending wallet and its new balance

Here's the part that's frustrating me...

at the bottom of the screen are three buttons
REMOVE      and button with a QR symbol   and a button that says CLOSE

This is my first time using Electrum Mobile and I just don't know its GUI sequence, not intuitive that's for sure, nor can I find any current videos showing the 3.3.8 GUI.
I'm checking blockchain.info and no change is happening to either address. I'm assuming nothings happening because I didn't send it on its way / executed the tx properly.

I expected it to ask for the private key so I could send it, but the buttons; 
REMOVE / QR / CLOSE all seem like wrong choices to bring up a field box to enter the private key. I have the private key as a long address, not a QR.
I'm guessing REMOVE cancels the tx and CLOSE just lets you out to go to a different area in the app but keeps the tx ready to sign later.
Choosing QR symbol button simply brings up a new large QR code with 2 more buttons underneath; "Copy to clipboard" or "CLOSE". Why would I need a new QR code, for what purpose?

I've gone to Electrums website, found their instructions and its not covered if you can believe it. There isn't even a title named "How to Spend".

Any help appreciated