you can create a testnet wallet on electrum only for the desktop version. But to receive the coins you may want to request here on the forum, I've seen some thread where testnets are given out but only if you have a solid use for it. Or you can check out this site
https://coinfaucet.eu/en/btc-testnet/, all you have to do is drop your testnet address.
Thank you hatchy I don't have electrum on my computer so I just downloaded mycelium on my phone to use I have requested some tbtc from the faucet link you gave to me but I have not received it in my balance yet. This is my address.
tb1pkxugrrxlwes34wncm5qqhpjudwzq6908y00kkks6f0745fhtcepsuwg0j6