first time

Good morning.
I entered just started using this site last night, and I don't know how to use this system...
I am always working at the this time, but today is holiday.

You can also say, 'I'm not sure how to use this system.' This phrase gives the idea that you are trying to learn and are practicing. For example: I'm not sure how to do this. I'm not sure how to wear this.

I changed it to, 'I am always working' instead of 'I always work' because 'I always work' is usually used for unspecified time (ぐらいのように）, so it sounds a little off. 'I am always working' is good for a specific time because it is a continuous action (続く動作かも知らない） that would be occuring at that time.

First time

Good morning.
I entered this site last night, and I don't how to use this system...
I always work at the time, but today is holiday.

KG