Correct

使不惯

/ shǐ bù guàn / 
Strokes

Example

As a Verb

be not used/accustomed to using

1
Wàiguó
外国
rén
人
dàduō
大多
shǐ
使
bù
不
guàn
惯
kuàizi
筷子
  
。

Most foreigners are not used to eating their food with chopsticks.