Update Tickers in Amiquote

Hi, there are some tickers which I could find on Yahoo but not in Amiquote. How do I get an update of all latest tickers in the market currently?

Similarly, how do I easily remove tickers which are no longer valid?

Thanks.

Be specific. What tickers you have problems with, specify them one by one.
Chances are that you are experiencing local problem that was explained many times on this forum:
https://forum.amibroker.com/search?q=yahoo%20load%20balancing

I chance upon a stock (SOFi Technologies) in the news but I did not find it in amiquote. Hence I added it in manually. However, I suspect SOFi Technologies may not be the only ticker that is missing, hence I'm just wondering how do I update the database to have the latest list of tickers available in the market?

I also tried to click on "update US symbol list and categories" in Amibroker but I don't think it helps.

Thanks.

If you have IPO you should just add the symbol manually via Symbol->New It takes 2 seconds.

AmiBroker is not data vendor. Update US symbol list and categories is "courtesy" service given for free and not updated everyday. If you don't want to add one or two symbols on your own, pay for the data to company like Norgate Data that will do all maintenance for you.