Thank ya, Jack/Arlin.
First of all, as Jack/Arlin said, "don't call admins noobish ._.", unless you're asking to be banned that is.
Second of all, as to your question, you may not, because you just joined LDA. You haven't even been tested, and no members are even allowed to participate in any tournaments before getting tested, let alone host a tournament.
Also, if you're looking to join a tournament, get tested first, then go to the Tournaments section, located under the Luminous Duel Arena, and above GFX Showcase, I believe. All LDA tournament information will be in the Tournaments section.
In addition to that, you cannot host a tournament, because you need prior approval by an administrator, after you organize your tournament. Because another member has already done so, I have reserved a spot for him to host his tournament after the current COC tournament, once he's ready.
And last of all, it's true; I'm on hamachi a lot, yet only 25% of that time, I'm actually there. I am often at school, and other times I'm just helping others. I haven't been actively on/dueling lately, due to school starting.
~Aster Phoenix