Step 1. Please navigate to https://www.adobe.com/acrobat/online/merge-pdf.html
Step 2. Click the 'Select Files' button
Step 3. Please select the files from your computer you would like to merge.
Step 4. Once you see the names of the files you want to merge on the webpage click 'Merge'
Step 5. Once you have merged your file select 'Download'
Step 6. You should now have a merged PDF file
Video Guide is attached below!