Whaf you really need first is to back up your Electrum wallet thus if ever your computer doesn't work well, you still have the chance to restore your Electrum wallet. Once you already did that, get the your Bitcoin address. You may find that through receive tab as you can see throgh this image:


Credits to: @bitcoinelectrum

You may also check a completed details on how to get your Bitcoin address in Electrum by clicking this link:
https://bitcoinelectrum.com/how-to-use-the-electrum-receive-tab/