Ensure the pack is for version 1.8.8. Unzip the file and zip it again if the pack folder structure is incorrect (the assets folder and pack.mcmeta should be in the root).
Click the upload button within the menu. Drag your downloaded .zip file directly into the browser window, or select it via your OS file picker. eaglercraft 188 resource packs work
: Launch Eaglercraft 1.8.8, click on Options , and select Resource Packs . Ensure the pack is for version 1
While Eaglercraft supports custom looks, a pack must meet specific criteria to work flawlessly inside a browser environment. click on Options