Firstly, please remember this board is not 'real time' like IRC is. You need to wait for an answer, there is no point replying to your own post bugging others to quickly answer you, it won't work!
The above suggestions are just four of hundreds of networks that are out there. The best resources to find networks include the mIRC servers.ini list (located in mIRC options in the drop down list), and sites such as netsplit.de
When you went to a channel 'before' (whenever that was), as was said above, you may have joined different channels. It is impossible for us to tell you how to get back there, you need to remember. For example, if you joined #mIRC on EFnet, it is not the same as #mIRC on Undernet, nor is it the same as #mIRC on DALnet - the same name, but different people. If you cannot remember the network you went on before, we cannot help you get back there.
Information on finding/creating a channel can be found in this thread
, you may wish to check it out. Information on connecting to a server can be found in the How To Install
Hope this helps!