Bitcoin Forum

I used "search" but it probably does not work or I do not know how to use it.
1-How do I go to a content that already exists in bitcointalk?
2-How do I go to a content I have replied on a particular topic?
Where should I find information to guide post a certain topic?

Sometimes it is easier to use a site specific search in Google. For example, if you wanted to look for "segwit", you would type
site:bitcointalk.org segwit

This allows to to set date limits as well.

Yeah Jetcash is correct. Its easier to use google, plus the fact that there's a waiting period in using the search of BCT make it a lot more un-useful.

As for the 2nd question. I believe you can follow threads where you have made a reply here (https://bitcointalk.org/index.php?action=unreadreplies) and check if someone replies to the thread.

As for the 3rd. *No clue about that. LOL

Forum's search function is annoying and it isn't much helpful.(May be only for me.)

For 1 & 3 questions - Do a google search instead of forum search. Google always gives priority for Bitcointalk search results. Or as example search like that "<Topic you want here> bitcointalk"
For 3rd question - Go to your account and then "show posts" . All of your replies are there.

https://image.ibb.co/iJdVex/Capture.jpg

Hope it helps.

Usually use search column and that working fine, just type the related word there (the content are you looking)
For example you looking for "ICO 2018".
Go to Home first
You can type that's word and click ''Search" button
And you will be find some related topics which are you looking!

This question answered by IsuruMaduranga (https://bitcointalk.org/index.php?action=profile;u=1589243) You can follow him! That's the beautiful answer.