First I want to say I am sorry for getting back to you so late. Been busy with school
Well the first Step to finding out if you are on the 5Ghz band is to know your router model and what type it is. If you have either a Dual band 802.11N router or have a 802.11AC router then you could get access in to the 5Ghz range. If your router is a single band then you will not be able to get the 5Ghz range and you would need to upgrade your router. If do have a router that has the 5Ghz range then most of the time it will say (e.g. Netgear5g and Netgear). In this example the Netgear5g would be your 5Ghz range. If your router has this then you would want to connect to it.
If are unsure if your router offers the 5Ghz range and would like to help Please provide the router Make and model (e.g. Netgear R8000 or Linksys EA3500)