Server Trouble

[CloroxBleach]

Recently I posted a topic about trouble with a sever for a modpack. I could connect, but my friends couldn't. So, a guy helped me and told me to change my static or dynamic IP address. I have static. I am on a wireless adapter, as well. So, I changed the settings to what he told me to on the adapter. He gave me a link to howtogeek.com. This showed how, and I did it. But, after doing that, i got a yellow triangle with an exclamation mark on it on my wifi bars. Therefore, not allowing me to connect to the internet. I am not sure how I can fix this.