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How to enable testnet
Testnet markets are hidden in the app by default. One switch in the profile menu lists them next to the mainnet ones. See Testnet for what's deployed and where to get test tokens.
Steps
Open app.textilecredit.com/s/swap and press Connect wallet.

Click your wallet address in the top right.

Turn on Enable testnet. The menu stays open so you can see it flip.

Open the token picker on the swap form. Under Network, pick bsc testnet or base sepolia, then pick a token.

Press Switch to BNB Smart Chain Testnet to request a quote (or Base Sepolia) and approve the network switch in your wallet.

That's it. Swap and limit orders work the same as on mainnet, see How to swap.
Some wallets can't switch networks from the app, like Safe or custody wallets connected over WalletConnect. Switch the wallet to BNB Smart Chain testnet (chain 97) or Base Sepolia (chain 84532) yourself, then come back to the app.
The setting is saved in your browser, so a new browser or a cleared cache starts with it off. Flip the same switch to hide testnet markets again.