After completing setup and enabling Shopping Ads, go to Seller Centre > Ads > Create Video or LIVE Shopping Ads.
You can also go to TikTok Ads Manager > Campaign > Create. From there, select Product Sales under Advertising Objective followed by TikTok Shop under Product Source.
Fill out your desired campaign name and set a campaign budget. (All your ad groups in the campaign will cease once you've reached your daily or lifetime budget limit.)
After you select the Identity for your shopping ad, you will need to input the remaining required ad group settings:

• Placements
• Audience targeting
• Budget and schedule
• Bidding and optimization

You can learn more here.