# Before We Start: Important

We will be testing the functions on the testnet, so it's crucial to select that network in your wallet before creating.

1. Click to change the network
2. Select Mumbai (Polygon Test Network)
3. Done! Now you can start using our products through Blockchain.

{% hint style="info" %}
To watch the complete video, [click here](https://www.youtube.com/watch?v=Jegmru0Q0j4)
{% endhint %}

<figure><img src="https://208195402-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTTzIOBDc8uxLlKR2IjZV%2Fuploads%2FMHnhQqEt0Uzn0lQ9sLte%2Fmetamasko.png?alt=media&#x26;token=c3d07337-b3e4-4055-97ee-feb4edee5f2c" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
Before creating an NFT, make sure you have already set the domain in the main section of the dashboard.
{% endhint %}

<figure><img src="https://208195402-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTTzIOBDc8uxLlKR2IjZV%2Fuploads%2FQdMjtEBbtAI3ocZPck01%2FScreen%20Shot%202023-11-14%20at%2015.00.46.png?alt=media&#x26;token=4234c49d-6fa3-47d3-aa54-b526f26254b1" alt=""><figcaption></figcaption></figure>

The domain must end with xerial.io. Here are some examples:

1. <mark style="color:green;">**name.xerial.io**</mark>
2. <mark style="color:green;">**shopname.xerial.io**</mark>
3. <mark style="color:green;">**marketname.xerial.io**</mark>

Wrong examples:

1. <mark style="color:red;">**yourname.com.xerial.io**</mark>
2. <mark style="color:red;">**yourname.io.xerial.io**</mark>
3. <mark style="color:red;">**name.com.xerial.io**</mark>

Inventory section:

{% hint style="info" %}
To publish your assets for sale, you need to have Polygon (Matic) tokens. In this case, since they are on the testnet, you can claim them for free as they require a fee for listing.
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> To claim **MATIC** Tokens on Testnet, [click here](https://mumbaifaucet.com/).
>
> To claim **USDC** Tokens on Testnet for making asset purchases, contact us and we will send you the ones you need, we are building our own faucet.