Adding current word to dictionary
I just figured it out. Lets just say, there is a word like " qpoacx ". When you type it and press space, it ll show you the word with red underline. 
Tricky part comes here. 


Remove the space.
You ll get the word you are typing in the suggestions. 
When you click on it, you ll be shown add to dictionary above the alphabets.(Not a drop down menu)


-- I ll add Screenshots in a while(in case if you didnt understand the content)