How to use the Kanji LookUp

Hi, Just completed the hiragana and Katakana lessons but I am curious to look into Kanji now.

But one thing I am confused with is the use of the Kanji lookup feature..

I cant find any useful guide on using this feature.

Firstly, I cant seem to find tthe right character I want and then I dont know how to add the character I want to my own custom drill.

Anyone out there knows how please enlighten me there!

Thank you for your kindnesss in advance.

Cheers!