On the options menu, click "Resource Packs.".Launch the game client through the Minecraft launcher.– if there are many different versions, just pick the one that you like or that you think your PC can handle Download the ModernArch R texture pack for Minecraft from the download section below.
NOTE: Many resource packs require optifine to be preinstalled, so be sure to install it. How to install ModernArch R Resource Pack: