Importing models is done by copying their import strings and clicking on Add model source from clipboard or on the + icon inside the toolbox ui. You can start with one of the following import strings:
W3sib3duZXIiOiJWaUNvUyIsImdyb3VwIjoiQ291bnRpbmciLCJtb2RlbHMiOlsiZ2VjbzIiLCJjZWRpcm5ldCJdLCJ1cmwiOiJodHRwczovL2dpdGh1Yi5jb20vdmljb3NsYWIvdG9vbGJveC1tb2RlbHMiLCJicmFuY2giOiJzbGFpZiIsInRvb2xzIjp7InJlY3RhbmdsZSI6WyJnZWNvMiJdfX1d
W3sib3duZXIiOiJWaUNvUyIsImdyb3VwIjoiVHJhY2tpbmciLCJtb2RlbHMiOlsiZGFtNHNhbSJdLCJ1cmwiOiJodHRwczovL2dpdGh1Yi5jb20vdmljb3NsYWIvdG9vbGJveC1tb2RlbHMiLCAiYnJhbmNoIjogInNsYWlmIn1d
W3sib3duZXIiOiJWaUNvUyIsImdyb3VwIjoiQW5vbWFseSBkZXRlY3Rpb24iLCJtb2RlbHMiOlsic3VwZXItc2ltcGxlLW5ldCJdLCJ1cmwiOiJodHRwczovL2dpdGh1Yi5jb20vdmljb3NsYWIvdG9vbGJveC1tb2RlbHMiLCAiYnJhbmNoIjogInNsYWlmIn1d
W3sib3duZXIiOiJWaUNvUyIsImdyb3VwIjoiU0FNMyBsYWJlbGluZyBpbnRlZ3JhdGlvbiIsIm1vZGVscyI6WyJzYW0zIl0sInVybCI6Imh0dHBzOi8vZ2l0aHViLmNvbS92aWNvc2xhYi90b29sYm94LW1vZGVscyIsImJyYW5jaCI6InNsYWlmIiwidG9vbHMiOnsicmVjdGFuZ2xlIjpbInNhbTMiXSwia2V5cG9pbnQiOlsic2FtMyJdfX1d