For the most part, on Enterasys products LACP is globally enabled by default.
For the most part, on Enterasys products (exception: C5 & B5) LACP is port-enabled by default.
Thus, for the most part no configurations are required at all. Just connect and go!
There are finer levels of available control, and special considerations based on the mix of products, that can make the discussion a bit more complicated, though. Further details provided may elicit a more detailed response.
You should also find that a search for "LACP" within this forum will yield quite a number of topics/articles that collectively may well answer any further questions you have. If your questions remain unanswered, feel free to add to this topic.