While I am searching answers on the Stack Overflow site, there are some users that know the technology of my concern and have often answered related to the same term that I am asking for.
How do I start a chat with him/her for my answer?
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If both you and the other user have at least 20 reputation points, you can follow the below steps to start a chat with that user:
Open that user's chat profile link. To find the chat profile link, first, go to the site's profile link (e.g. https://stackoverflow.com/users/3061020/jatt-net). Then, follow the relevant bullet for your site:
Stack Overflow or Meta Stack Exchange: Add "chat" in the URL before the domain name, e.g. http://chat.stackoverflow.com/users/3061020/jatt-net
All other sites: Follow the link to the user's "Network profile" on the top right corner. If the link is not present, go to the "Activity" tab in the top left, then scroll down and follow the link to "Account" on the right. You should end up with a link like https://stackexchange.com/users/3674664/jatt-net, which is the user's network profile. Change the URL to the form
https://chat.stackexchange.com/account/[network profile ID], e.g. https://chat.stackexchange.com/account/3674664.
Note: In either case, if the user has never visited the chat site before and created their chat profile, you'll get a 404 error when following the above methods.
Click on start new room with this user, or you can also invite to existing room you're inside.
In case either you or the other user don't have 20 reputation, or the user has never signed into chat before, it's not possible to have a chat without moderator intervention. (Moderators can give explicit chat access that bypass reputation restrictions, and can "super-ping" users to send chat notifications even if they don't have a chat profile.)
If you don't see a "start new room with this user" button, the likely cause is that you've been automatically banned from creating rooms as a result of being repeatedly kick-muted from another chat room. Go to
/rooms/new on the relevant chat server (https://chat.stackoverflow.com/rooms/new, https://chat.meta.stackexchange.com/rooms/new, or https://chat.stackexchange.com/rooms/new); if you get a page that tells you you're banned from creating rooms, you must contact a moderator to remove your ban before you can start rooms with other users (or invite users to existing rooms).