I pay for roku each month but cant get on tv i have wifi connection what am i missing

The first thing you're missing is that Roku is free.  If you're paying someone, you're paying for some service and you may be paying through Roku, but the provider is getting the bulk of that money.  Roku only provides The Roku Channel which is absolutely free, but does have paid content that comes from other providers.  The other possibility is that you're be scammed.

So, what are you paying for and what can't you get?  We need a lot more information to be able to help.