I understand that you have a Slingbox 350 that you are trying to configure in Israel and you are not seeing Israel within the country selector screen. The reason for this is due to the fact that the Slingbox 350s and 500s are not currently available in your region.
For a list of countries that the Slingbox 350s and 500s are compatible in, see the link below:
If you would like to request for the Slingbox 350 and 500 models to be available in your region, post an enhancement request within the forum area linked below:
I apologize for the inconvience.
Sling Media Forum Moderation Group
I assume you have already done a proper Forum Search for your model number in case other people have already answered your question ?
If so and that didn't help then check out this thread: https://community.sling.com/thread/3300?tstart=0
Come back if it that doesn't help either.
(NOT a Sling Media representative, just another user)