first make sure you have the latest version of
Electron because that is the bitcoin cash wallet not Electr
um. the latest version right now is 3.1.2
https://www.electroncash.org/it should automatically connect to BCH nodes, there were bugs in previous versions but they are fixed now. if you are not connected to a BCH node then try doing it manually from your Network setting inside Electron wallet.
let it sync, restart the wallet if necessary, and if nothing worked try restoring from your seed or using the portable version.
if these simple solutions didn't work it might be a new bug. if it is then show us the address you have imported and the transaction that your wallet gets stuck on.