Step 1. Go to the BLAST website
Navigate to https://blast.ncbi.nlm.nih.gov/ in your web browser.
Step 2. Jump to Protein BLAST
Hit the "Protein BLAST" button. The Standard Protein BLAST form will appear.
Step 3. Select "Align two or more sequences"
Select the "Align two or more sequences" checkbox.
Step 4. Paste your sequences
Paste one of your sequences into the "Query Sequence" textbox and the other one into "Subject Sequence".
Step 5. Click BLAST
Hit the BLAST button at the bottom of the page. This will generate the pairwise alignment of your sequences, and you will be taken to the page that gives you the results.