In this sentence:
En el momento en que llegues al trabajo, saluda a tus compañeros cordialmente.
When/the moment you arrive at work, greet your colleagues cordially.
The first verb is in the present subjunctive: llegues (cuando llegues...)
The second verb is in the imperative for tú: saluda
So, this is telling you to do something (an imperative = greet your collegues) when you arrive at work (whenever that is, future idea)
Here's a lesson that explains how to form the imperative (affirmative) for tú. The form coincides with the 3rd person singular of the present indicative.
I hope it clarifies it.
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