(ask) how to use two internet connections simultaneously

Hello,
I want to ask, i have 2 internet connection with dynamic ip public,
and i want my user can use 2 internet connection simultaneously

how can i do that with mikrotik? anyone have same problem with me?
sorry for my bad english

You can look in the wiki.mikrotik.com for examples.

Splitting csn be done in Mangle with NTH or PCC and only Routing-mark New connections so that the streams are complete going trough one or the other port.

In IP - Routing you can use that routingmark to select the gateway (ISP) of the connection.