This is the 896th most frequent German word.
stellen
"Stellen" means "to place," "to put," or "to set" in English.
Here, 'stellen' is used in the context of physically placing an object somewhere.
Ich stelle das Glas auf den Tisch.
I place the glass on the table.
In this example, 'anstellen' (a derivative of 'stellen') means 'to queue up' or 'to line up'.
Kannst du dich bitte vorne anstellen?
Can you please queue up in the front?
'Stellt sich' is a reflexive usage of 'stellen,' meaning 'to arise' or 'to come up' in this context.