به کانون زبان پاسارگاد خوش آمدید.

Since is used with the present perfect to express that something has happened since a point in time.

Examples:

I've lived here since 1999.
She's been working hard since two this afternoon.

For is used with the present perfect to express that something has happened for a period of time.

Examples:

I've worked at this job for 10 years.
Peter's been playing tennis for two hours.