The share feature (which is not implemented or activated on all servers) allows players to give credits/evos to their teammates. As opposed to the Donate command, the Share command does not spread the given amount automatically. You have to specify the name of a teammate that is to receive the credits/evos.
Syntax:
/share medpl 1
would give 1 evo to your alien teammate "UnnamedPlayer". If you want to be funny and spammy, do that while playing on the human team. Otherwise, better use
/share medpl 100
If you're about to leave the team or server, be nice and share everything you have.
As demonstrated, you don't have to write the full name or the beginning of the name. You could theoretically also use the player slot ID returned by listplayers.
The syntax is different on some servers. There, you have to give the amount first and the name second.