I see that the Splunk answers page has been updated a few weeks ago.
In the previous version, I used to save or favorite many questions that I was interested in.
Where can I find those questions now ? And also the questions that I have asked previously , where can I find those ?
Favorites were not migrated to this new platform. See the announcement at https://community.splunk.com/t5/Announcements/Splunk-Answers-is-being-replatformed-answers-splunk-co... This announcement was also posted on the old site prior to the move.
You can find the questions you've asked in your profile. Click on your avatar in the upper-right corner of the page and select "My profile". Then scroll down to "Topics I've Participated In".