Zenland does not offer any exchange system as many cryptocurrency exchanges do. If you do not have any of the supported tokens (stablecoins), you may use Uniswap, or any applicable “swap” website to exchange the altcoins for stablecoins within the chosen network.
Once exchanged you may proceed with your contract by deploying and transferring it to the selected network.
Quick Tip Note that you must have the token supported by your network of choice. Refer to this post to see which stablecoin tokens are supported by the major networks.