I do appreciate you want to do this for me, but if you don't mind too much, I would prefer to learn how to do this myself.
If you rather just handle this one for me, around 700sat/byte (1.5mBTC) is what Electrum automatically puts the fee on. This is fine if you think that is what it takes at the moment. Take it from 1Nejxrk4Y9Q2eQ6YTd3hMi46uSnnN4Ghbn. I do see a Sign and Broadcast button when I preview a transaction, so I should be able to handle it from there.
Thanks again.
I'm a big fan of people wanting to learn

The "problem" is that it's easyer to create a raw, unsigned transaction if you're running a synced node (like i am doing), electrum is perfect for signing transactions, but not so good at doublespending unspent outputs that have already been spent.
If you want to learn the basics, you can download the sourcecode of coinb.in, i've actually written a small post on my blog on it's basic usage a long time ago:
http://www.mocacinno.com/blog/create-sign-broadcast-transactions-using-coinb/I wouldn't use coinb.in to sign the transaction tough (so you don't need to follow the complete article).
If you succeeded in creating a double spending tx using coinb.in, please post the unsigned transaction in this thread and i'll review it for you and give you some pointers on how to sign it using electrum

--snip--
But what happen to my BTC? I don't understand your point. It will be gone or not ("BITCOIN")? please straight to the point. Thanks for the info.
no, it'll not be gone... It'll either be rebroadcasted indefenately, it'll be confirmed
or after a long time most the network nodes will have removed it from their mempool and they will act like the transaction never happened.
Wether or not it'll be rebroadcasted: no idear, since you didn't give the information i asked for, and the answer to this question depends on this info.
Wether or not your wallet will react like the transaction never happened: no idear, since you didn't give the information i asked for, and the answer to this question depends on this info.