To type a Accent or symbol or emoji, you need to Hold until the special character popup menu is displayed.
If you hold a key, It will show a pop up menu with special characters and below of that it will show numbers from 1 to no. of the characters.
You can type that dulled number for your chosen character. After pressed the number you can see the symbol shown on the screen.
Repeat the Special Symbol again.
While holding the key and typed using the corresponding number, if you want to repeat that symbol again means just press space-bar or any symbol (like hypen or =). This action will repeat the special characters or symbols as per you space-bar touches.