Use plugin with login widget

Hello!

I use “Woocommerce account widget”, it use standart function “wp_login_form”. How can I add captha to this form?

I used hook add_filters( ‘login_form_middle’,’cptch_custom_form’ ); (like this – https://wordpress.org/support/topic/using-captcha-with-wp_login_form-function?replies=5 ) – error: Fatal error: Call to undefined function add_filters()

Can you help me?

https://wordpress.org/plugins/captcha/