THanks for the help, right now I don't have WIndows :C old crappy pc, but I thank you for helping me so much but I still have a question: What Modmii can't do or doesn't do? WHat I have to do manually?, I didn't understand the priiloader part if I had to use Modmii carefully to install it or If I have to install it again manually, still thanks for your help.
Modmii simply generate a guide and generate/download all the necessary files for you.
I believe you can run Modmii on Mac with a Windows virtual machine.
You can do everything manually or follow other softmod guides but then you risk following wrong/outdated guides and find bad/outdated files and if you missed some important steps, you will brick your Wii.
basically,
1. you don't an exploit to reinstall HBC as you have it already installed. You can simply rerun the hackmii installer from HBC to update it but you can leave it for now as your HBC is good enough apart from not using ios58
2. you may skip installing clean ios36 and ios58 for now as that is not the source of your problem.
3. verify that you are really running the latest Usbloader gx by reading from its launch screen or credit page. If not you probably have install a full channel of Usbloadergx in system menu - uninstall it and install a forwarder instead or simply run Usbloadergx from HBC. This will eliminate an important factor before diving into softmodding.
4. You probably already have a Wad manager installed. I haven't touch that for ages (don't have any need to use it). I heard YAWMM or Wiimod are good. Other users may have better recommendations.
5. download and install d2x-v10-beta52 or beta32 alt for Wii (not vWii) on slot 249 with base 56, slot 250 base 57 and slot 251 base 58. You only need slot 249 base 56 for now but the other two are handy for a few other games. You have to find the proper Wad as you can't access Wifi with your Wii.
6. For your Wifi problem, try reinstalling system menu and Priiloader as I mentioned before.