I'd like to recheck what I spoken out.

1. Our restaurant is right across side in front of metrotown mall.
on the Kingsway(road name). so, if you stand in front of super store or kingway exit of metrotown(mall), You can find this the restaurant easily. It is right over side(=across side) of metrotown mall.
Where are you, now?

I'm sorry. It is difficult to understand these directions. 식당은 metrotown이 앞에 있어요? I don't understand "across side" and "over side."

2. We don't have the umbrella bin(?- This restaurant doesn't have container for umbrella. I already said to boss, but he doesn't care. so, when it rains, i feel a little uncomfortable.)Sorry, just put on yourside(?-it means putting beside of the guest seat.) or door way.

To be honest, I don't know what the container for the umbrellas is called either.

"I'm sorry. We don't have anything to keep the umbrella in. You can keep it next to you or lean it up against the doorway."

3. The washroom is for both female and male. and we only have one room for one person.(Is it alright to speak to other?) I understand this sentence.

"The washroom is for both male and female, and there is only one stall."

4. (on this restaurant menu, just listed the ingredient of the dishes. some customer misunderstand this, think that the ingredient is option. Does it make sense to you? yes) This ingredient all put together in an dish.(is it casual?) So, it doesn't choose option(?), just listed the ingredient. If you don't like something, you can take it off.(from the dish) Does this mean the customer takes it off or orders it without something?

"You don't have to pick anything as an option. It's just listing the ingredients in one dish."

Customer must take it off himself - "If there is something you don't like, it can be picked off."

If the customer can order the dish without an ingredient - "If there is something you don't like, you can order it without."

5. I think this phone's ringing sound is too noisy loud. Can I turn it down the sounds a little bit? or changed it to other tune?

If you are talking about a cell phone, we call "tune" a "ringtone." = "Can I change the ringtone?"

6. -how many dumplings are in one order of frozen dumplings?
- it's around 52~53.(Apprently, it can use -ish. like:" 52ish.)
but it depending on gram, not number.(it makes sense??? The dumpling is selled on gram. not dumplings number.)

"There are about 52 in one order. We sell the dumplings by weight not count."

~ish is used in casual settings and can be used on it's own as a sentence.

Ex:
Friend 1 - What time will you come over?
Friend 2 - I don't know. 5ish.

Person 1 - How many dumplings should I make.

Person 2 - 20ish.

7. You already order one for rice, What about make an order for noodle? (like one dish is rice, one dish is noodle at the same meal, share~! together) You mean order noodles instead of a 2nd order of rice?

"You already have one order of rice. If you want, you can order noodles instead of rice. Then you can share."

That's it. Here It seems that we are would be getting busier.
bye~^^ Thanks!

I hope this makes sense. Please let me know if you have any questions. It's hard to answer since I don't know the complete context.