Jester does not lock targets on his own. You have to ask him to lock (STT) the target, enemy (when identified already) or specific contact (depending on range and bearing, can also be datalink contact here). He does IFF by himself and change modes RWS/TWS-Auto. You have to also ask him to change the radar antenna direction if you want the search area other than straight ahead.
By default pilot operates flares and Jester does chaff but it can be changed in countermeasures menu. He releases CMs based on programmed triggers like RWR indications and launch smoke visibility.
Here are your support options, incl. e-mail:
https://www.digitalcombatsimulator.com/en/support/
You can stay logged in if you set DCS to remember your credentials but it may still ask you for the password when there are problems with authentication server or your authoristation data file is lost.
You can also use offline mode if you play single player only and don't intend to update DCS at the time:
https://www.digitalcombatsimulator.com/en/support/faq/authorization/#3300385
You don't just delete account because you have some trouble - you'd lost all your licenses.
Forgot to mention - the voice over for Yak aircraft says [Jack] instead of [Yuck] but I know it's minor and you probably wouldn't want to rerecord the file again