1. Explain it simply
有点儿 + adjective means 'a bit too...' and carries a mild complaint.
Put it right before the adjective: 有点儿 + adjective.
Use it for unwanted things like 有点儿贵 or 有点儿冷, not for good ones.
2. Show examples
今天有点儿冷。
Jīntiān yǒudiǎnr lěng.
It's a bit cold today.
mild complaint
这件衣服有点儿大。
Zhè jiàn yīfu yǒudiǎnr dà.
This garment is a bit too big.
有点儿 + adj
我昨天有点儿累。
Wǒ zuótiān yǒudiǎnr lèi.
I was a bit tired yesterday.
undesirable
3. Share a tip
有点儿 goes before the adjective and carries a complaint - use it for unwanted things (有点儿贵), not good ones.