First you will navigate to https://bscscan.com/ and input your wallet address into this window and click the search button.
You will get a window which looks very similar to this. You will want to click the little icon next to the To:
here you will input Splinterlands wallet address 0x3a45ff7Fb721580619070422f32bbfD80555FDcE
You will want to find the transaction you are looking for the receipt for. If you are looking for your spellbook purchase receipt I would suggest looking for the oldest one. You will click on the TxId link circled in red below.
Next you will come to the actual transaction information. For a spellbook purchase look for a transaction with a value right around $10 sometimes over and sometimes under. The please click the to see More.
You will then see this screen. You will need to click the Decode Input Data.
This what the entirety of the transaction looks like. We will need both the TxID and the P- from the transaction as text in your ticket. A screenshot of the screen would also be useful.