The Dell Vostro 1510 laptop does not have a built-in 5GHz Wi-Fi adapter, so you would need to upgrade the adapter to one that supports 5GHz. Here are the steps you can follow to do that:
Check your current Wi-Fi adapter: You can check the model of your current Wi-Fi adapter by going to the Device Manager in Windows. To do that, right-click on the Start button, click on Device Manager, and then expand the Network adapters category.
Purchase a new Wi-Fi adapter: Look for a Wi-Fi adapter that supports 5GHz. You can find one from Dell or other third-party vendors. Make sure the new adapter is compatible with your laptop.
Install the new Wi-Fi adapter: Turn off your laptop, unplug it, and remove the battery. Then, locate the Wi-Fi adapter in your laptop, and remove it. Insert the new adapter and secure it in place. Reattach the battery, plug in your laptop, and turn it on.
Install the drivers: Once your laptop has booted up, install the drivers for the new Wi-Fi adapter. You should be able to find the drivers on the manufacturer's website or on the CD that came with the adapter.
Connect to the 5GHz network: Once the drivers are installed, you should be able to connect to 5GHz networks just like you would with any other Wi-Fi network.
I hope this helps! Let me know if you have any further questions.