I can’t connect my Wi-Fi to my roku because I don’t have the remote so can I download the mobile app and do it that way cause I’ve tried and I’m having issues very frustrated please help me !!!!
The Roku app on a mobile device can only connect to a Roku that is already set up on the same local network as the mobile device is using. This means the Roku app cannot be used to set up a new net connection for the Roku device.
If your Roku was previously set up on a prior network, and if the Roku has not had its net connection reset nor undergone a factory reset, it is still trying to connect to its former net. If you can set your Roku to the same net name (SSID) and password as your previous setup, your Roku maybe able to connect to it. If you then connect your phone to that net you should again be able to control your Roku via the Roku app.
Otherwise, you'll need to have a remote compatible with your Roku model to set up your connection to the new network/password.
All Roku devices other than Roku sticks will respond to a shared set of infrared (IR) commands so any cheap point-at-the-device universal remote you find at Walmart or a dollar store that says it is compatible with Roku Devices will work as long has you have a direct line of sight to the Roku. Or you can buy one from Roku via https://www.roku.com/products/accessories/player#Remotes
Roku TVs use a separate set of IR commands so make sure any point-at-the-device remote you purchase says it is compatible with Roku TVs -- if it just says it works with Roku it probably will only control a separate Roku device not a Roku TV with Roku built in.
Roku sticks are usually out of sight behind the tv and so do not use IR. For Roku sticks you will need a "point anywhere" Roku remote connecting via radio frequencies (RF through Wifi-direct). See https://www.roku.com/products/accessories/streaming-stick#Remotes or search on Ebay or Amazon for a remote for your Roku model number. Purple Roku sticks (model 3500) have long been out of production and require a unique remote that is no longer available.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T