If you want to use Chatter functionality to communicate with your customer on Web Quote please set up the steps for its activation:
Navigate to the setup (top right corner gear icon and then Setup), Users and click on user's Full Name.
https://lh4.googleusercontent.com/VlzCvoxUHxNfWFkCypgMrqOYiPueED4pg64MrcRN3cuqMi1BIBr5dhqxc3Ulu-kVK13udc5180zYre4Gmjv99010-XgXypur2ycZxjHdFiaBJMeWyc0r8nmRzubTOAVE6wOG_1axPs2o4GpW9AQ6W8Dq7Lx7CRD3nnSTKAmVWLqU9UFN4z2rBl7JFcYWJQ
In URL copy the User ID
https://lh5.googleusercontent.com/rPi1Bi2PGtEcJh8LLaOafrzmtMk4sqF8NVRKbt730sBkMWviekvU8EAzkoPXfB2z8i2ubeZ9a89blubRoounmQz1Obb2hyrrGxuDPzAqs-bXWp_-WzvyhXnFjfdGrnias3Ou_midHVGePkYW7a7bz3_V6iq7jj0U6Yi53w_j1-7EQv32vyCqYPDzINKWrQ
In Setup navigate to Custom Settings and choose Dynamic Chatter Settings, click Manage.
https://lh4.googleusercontent.com/gl-hsFjvJHm_KpqnoAiF2zM574UgHhQOqT69iSClLUBFOCMiUe7ANEtLPnXGWoMeldCQRG1LT8wY4dWC9mhHOTcQ9_VOGFB2wAn_5dBT_hhLPNCm42bMe6fmd5JBu_SOnm5u-nTG8-fetEbHVdoZLHFuVAObC6l1pJCS0k-2_zVPi6MnGZPB_OuAC5u9IQ
Click New.
https://lh3.googleusercontent.com/5_BdJ6KPY-IhP5R8dGrZQUjmfckf11n1q3CAqlybQnhEh-iGlKIEfXlaRy3XaasHmPGKKkKX0NdvMVHgYSNiUQxjkiZUl3YZbDV-iF2g_0lD0eWSdqO3H0Xru_r6L4iicUGxhNOObkgVKA2Pd_8enxqpbIUwByGOjkXGoUyRKjIFpG3zx9BOrimgafVA4Q
By default Activate Chatter checkbox is set to true - don’t change here anything.
https://lh5.googleusercontent.com/Xdv9VyngxrFvoO36TRPS7MYObio6OgxbmUHKhLnV4gXK5dB8Ad4e6GbXrACf4EFHphVpCDmqwjFz_bGLQ7eDW3I8vKNa5vY08UGhS8lf7HhLlbQl-_jf3n8Osmm58z-QpT5Gr6bgrK6stilDASrBP_jP0BSqoCEblR5WQzzVp0pqfPXGKpcajG15AkJopw
Paste this value in the Guest Chatter User Id field, paste your message in Welcome Post Text field, for example, ‘Please write your question or comment in the box below’ and click Save.
https://lh4.googleusercontent.com/emv1ObPBjzFe9jWugUUljoW-CGS6p1J6EEk-U5rCdQ9Uma1rJ4yjCKA23R9RAl0RGgEUpkB8fdAuvvfg3zUrkW_NSJEUS0yRzBKhG1QAX_YK5v6DzAcUGwKELqfqZOOFPY_Qgew1wlf92CaOG1c1vWYeYEElmfndudhO-4kd_3_Wp95fs7UuhOlZkQZ8EQ
Now Chatter is activated and ready to use on Web Quote, let’s see the result of customization
https://lh4.googleusercontent.com/cswTieGy9Tm1BaV-WxZbkkKm_IiKqadH-aoJdFEiQOUS4gFaQ7EtkYdAcxwz6CbZ-M8cQ7KSzarSvEFYKC6gojFtjvQ-kmjcc-eu4sLWs_G0wXZiShmIk0riNjFCo5SlTVsury_Iu3cx0Z4o4_w1PFmEbu5wn8WWCjmBJG36ke85k35XLIjSa3EkEEDjhQ