Find my Google,Bing and Alexa verification ID

Hello all,

I am working on my site SEO but i am a newbie. I have made accounts for google webmaster tools and all that. I cant find my google meta tags now. E.g: <meta name=”google-site-verification” content=”rCLLGGTVdEiGe+DXLHKLCD670B8f99LfK/Ax6s=” > i had this code somehow few days back but i dont know where i got it. Also help me finding this for alexa and bing.For seo is it enough to just find a tracking code with google? I know it requires so much of other things but currently just help me with YOAST SEO plugin where i can put these ID’s of google, bing and alexa.

thanks in advance 🙂