Enabling Link aggregation on a procurve switch

I have a ProCurve 2848 switch and I would like to get link aggregation to work. The switch has been updated with the newest firmware, which is supposed to support it. However the server states that it isn't configured to enable link aggregation. When I have asked in procurve forums they talk about port trunking - but in the article here on afp548 (https://www.afp548.com/article.php?story=20060724001126511) it seems that some has managed to do it without doing major configuration on the switch - has anyone any good input? (I have looked in the online manuals, but they seems only to cover much more advance setups with multiple switchs etc - we have only one vlan and one switch. TIA, Peter