It has been a while since I used Easynet. I bought a PCMCIA card for my A1200 from AmigaKit years ago and it was supplied with that (probably v1.0 as it was so long ago). IIRC, the instructions were quite simple and I had to manually input a few things like IP Address, Net Mask, DNS Server address. I remember scratching my head and wondering how to find out if the numbers I entered were correct or not when a screen popped up saying "New version of your software detected, downloading..." I took that as a good sign.

Personally, I use Genesis on my A4000 now.
Assuming you have a Router attached to a cable or DSL modem, plug a PC into it, open a DOS window and type "IPCONFIG /ALL". You'll be able to get an IP address from there (change the last 3 digits though so if the PC is 192.168.0.101 then use something like 192.168.0.109 for your miggy), subnet mask is probably 255.255.255.0 and the DNS server should be listed too (and perhaps an alternative or secondary DNS).