Update purchasing-nodes.md

docs/node-sale/details/purchasing-nodes.md

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 id: purchasing-nodes
-title: Purchasing Nodes
+title: How to Purchase Nodes
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 # Purchasing Nodes: Steps and Payment Options
 **Supported Blockchains and Payment Methods**: The sale will be conducted in wETH on ARB, but we provide a live bridging gateway at checkout that supports multiple blockchains (ETH, Arbitrum, BNB), with accepted tokens including ETH and USDC. All purchases require a compatible wallet, and the resulting node licenses are issued as non-transferable ERC-721 NFTs.
 
 ## Video Tutorial 
-TBU 
+https://www.youtube.com/watch?v=Z2QHJfjqCtM&ab_channel=0G
+
 Note that this video is for demonstrative purposes only, may not reflect exact details and have different prices or tokens than the actual sale.
 
 ## Step-by-Step Purchase Process: