You can share your devices with Maid White through your Maid White app and pair the devices with Echo through Alexa app. To use this skill, you need an app called Maid White, a Maid White account and at least one smart home appliance supported by Maid White. You can check if your smart home appliances are supported by Maid White on: https://www.tih.tw/supported-brands. You can download Maid White app from either Google Play or App Store and sign up a Maid White account in this app.
First, open Maid White and register an account. Second, sign in, then tap "+" on the device list. Third, choose the brand of the device you want to control through Alexa. Take FamilyAsyst AiPlug for example, tap the logo of FamilyAsyst, enter your phone number and choose the device. When you finish doing these steps, you can control the plug through Alexa after enabling this skill.